#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int add(int a, int b)
{
	int z = 0;
	z = a + b;
	return z;
}

int main()
{
	int a = 10;
	int b = 20;
	int c = 0;

	c = add(a, b);

	printf("%d\n", c);
	return 0;
}